Genetics Review

Recessive genes are shown using what type of letter?

• Capital letter

• Lowercase letter

Sections of DNA that have instructions for a specific trait are called _______________

• Genes

• Heterozygous

• Fragments

The passage of genetic instructions from one generation to the next is known as

• Alleles

• Heredity

• Variation

Different versions of the same gene are called

• Editions

• Varieties

• Alleles

The brown eye trait is dominant over blue eyes. Which of the following genotypes best represents the phenotype for blue eyes?

• BB

• Bb

• bb

Which genotype below represents a homozygous trait?

• Aa

• AA

Each organism has 2 alleles for a particular trait. Where do these two alleles come from?

• One from each parent

• Both from one parent

• Alleles do not come from parents

An organism’s physical appearance of visible traits is a _____________.

• Genotype

• Phenotype

• Homozygous

Select ALL options that describe phenotypes. (There are 2!)

• AA

• bb

• blue eyes

• black fur

What is called when a organism has two different alleles for a trait? Example - Tt or Rr

• Heterozygous

• Homozygous

• Domozygous